Fuse box wiring

[Balfadiff]

Does anyone have a good wiring diagram for the fuse box? Mine have been somewhat butchered. I notice by feel that some of the bottom of the fuse holders have no connection, unless the were wired directly and are now gone,
I am mainly interested in the ac blower 20 amp fuse. Previous owner used an in line fuse holder hooked the the turn signal fuse. I see the blue wire with black connector that should go to the blower fuse.33476 Here?s what I got.

[Barry Wolk]

You can remove a fuseholder clip from an unused bottom location and install it above the burned phenolic circuit board. I'd fix it by drilling a 1/4" hole on the burned board and filling it with Lab Metal or some other material that will hold it's place. Putty epoxy would work, too. Sand both sides flat. Bondo or lead are too soft to stand up to compressing new rivets. Drill a hole for the rivet and install with a very thin stainless washer on both sides of the repair, something for the rivet to compress against , holding the plugged spacer in place. They have to be thin or the clip won't line up well-enough for a sound connection. I hardly ever find the correct fuses used.

There is nothing in the Service Manual that covers the fuse box. There is a chart in the Authenticity Manual that gets glued to the underside of the fuse box. That's about as close as I could come for the info you seek. All of the systems controlled by those fuses are covered separately as systems. Maybe it's not covered because it's not a system. I would not trust the way they are hooked up. Some people like certain systems key-controlled systems hooked into constant battery power. I recall some vehicles were coming back to the CB chain I was associated with because the customer wanted them direct wired to the battery so they could yammer all night long and wake up to a dead battery.

[Balfadiff]

Thanks Barry. I knew I’ve get some good info from “Mr Mark II”. I have a plan to fix the fuse holder. My question is, the previous owners put in an aftermarket fuse holder. They attached the blue wire (I’m assuming from the blower) and the other end of the fuse holder was attached to the turn signal fuse. (again I’m assuming to get power). When I feel the bottom row of the fuse holder board, where the intact bottom contact is still in place, I don’t feel any wire connection point. When I feel to the neighbor fuse, the 20 amp AC clutch fuse, I don’t feel anything there either. I say feel because it’s impossible to see behind the entire fuse holder board. My long experience tells me a fuse holder should have power on one end and the circuit on the other. In this case the blower. Any comments are welcomed.

[Barry Wolk]

If I'm understanding what you're saying is that you're feeling no tab to attach the wire to. I believe the tab is a separate component that's sandwiched by the rivet. I don't happen to have a car taken apart at this time, but my car went through a very extensive restoration of its engine compartment and there are likely photos you can use. I can't seem to post detailed photos here, but I can e-mail them if I find some that are promising.

[Balfadiff]

Yes that’s correct. No tabs. I believe that’s why the previous owner(s) drew power from the turn signal fuse. It’s not a big deal because I bought a 20 amp glass fuse holder from Digi-key for $3.06. It even has a nice hole in the middle so I can attach it to the Masonite board. I’m just trying to find the other wire. I don’t see any other loose wire. I have the blue wire with the black female connector which is definitely part of the factory harness, but can’t find the wire that would connect to the other end of the fuse. Hence the ask for a wiring diagram of the fuse box. What ever you have you can send to adifabbio@comcast.net and thanks much. Art.

[Barry Wolk]

Sent. Hope they help.

[Balfadiff]

Your pictures were very helpful. In my estimation, looking at your pics, and my fuse box, there are no actual separate wire connections on bottom of the several fuse holder. There is a brass rail that runs along the bottom edge of the Masonite board. The blower fuse and AC clutch and others seem to power the fuses from this brass rail. I’m investigating where that brass rail draws its power. Do you agree?

[Barry Wolk]

They are called Busses, a common term for electrical transmission that use a larger current carrying "bar" that can be tapped anywhere along its length to supply identical voltage. One "constant power" Buss Bar gets its power directly off the battery. Often, the other buss bar gets its power through a relay that can carry more current than the contacts internal to some ignition switches. I recall the Ford ignition switch debacle blamed on large keychains. Ford had a huge problem with brake light switches that caught fire because they were wired constantly hot, even while you slept. The switches were used to shut off the Cruise Control while you're driving. I use mine all the time while I'm driving when I'm sleeping. :)

[Balfadiff]

3347733478 Hi Barry: sorry to bother, but I thought if you knew off the top of your head what relay this is, it would save me an hour or so researching the componens identification. That “buss” bar on the lower row of fuse holders gets power from it Thanks Art._-

[Barry Wolk]

Your photo link didn’t work. E-mail the photo to me.

[Barry Wolk]

That’s the SIP relay. It lights the low fuel warning light on the gauge cluster. If yours does not work someone was making a modern equivalent.

[Graham Rollo]

Mark Norris makes a replacement, I have one fitted & no problems33483